I liked AC/DC more when Brian Johnson joined the band. I guess I'm in the minority with that, but I never really cared for Bon Scott. He always sounded like he was messed up on drugs. Johnson was more of a metal singer to me. It's kind of like the Roth VS Hagar thing. You have some Van Halen fans who are strictly David Lee Roth, and some who are strictly Sammy Hagar. I liked music from both lead singers. I like some Bon Scott lead AC/DC songs, but most of my favorite songs come from Brian Johnson.
Having said that, AC/DC hasn't been the same since Malcolm had to quit. And of course, without Brian Johnson, I don't see how you can have an AC/DC. I think they're done as a band. They have a great catalog that will live on, but unless they were able to reinvent themselves with a group of younger guys who would be granted rights to the name, I don't think you'll ever hear anything else from the band.
I know that Gene Simmons has talked about KISS being more of a brand than a band, and having him and Paul pick their replacements in the band. In a way, I think that would be neat. If a group of young rockers in their 20's was able to carry on the legacy of these bands while having an updated sound that pays proper homage to the legacy sound, I might could get into that. There's no more rock bands in today's popular music. All rock is underground now.